I post this in the hopes of helping others as support is poor from manufacturer.

When checking the integrity of the backup and finishing the backup it would say

Bad Container Block: 0x6b2a
Internal error during operation. Please see hdmengine_fdisk.txt for more information
Operation failed:
Disk is not valid.

Well the hdmengine_fdist.txt is pretty unintelligible.

I eventually figured that the word container led me to think it had to do with the usb drive that I was using. It was a brand new Seagate USB 5 TB drive.

I called Seagate and in 15 Minutes was talking with a tech. (take note Paragon, as you have no phone support and only respond to some emails at your choice days later)

The tech suggested to me that the drive was formatted in exFat format (based on looking at windows Disk Manager) And if I only used windows try deleting the partition and format in NTFS. The disk comes formatted in exFat is so that the drive can be used with Mac and Windows. I only use Windows. So I did this and then did backup with no errors with integrity check. This has taken me 5 days to resolve of wasted time that Seagate solved in 15 Minutes. Yes frustrated.

So if you have an error like this, this COULD be the issue.
regards to all.